How do reverse a number (like 1284 to 4821) without resorting to string manipulation?

Question

How do  reverse a number (like 1284 to 4821) without resorting to string manipulation?

Anonimo · Accepted Answer

int x, y;
y = 1284;
while (0 != (x = mod y by 10)) {
    stack,push(x)
    y /= 10
}

x = 0;
while (null != (y = stack.pop()))
    x = (x *10) + y

x == 4821

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